#!/usr/bin/python
# http://projecteuler.net/problem=14
# 

import time


""" 
Starting in the top left corner of a 2 x 2 grid, there are 6 routes (without backtracking) to the bottom right corner.


How many routes are there through a 20 x 20 grid?
"""

def main():
    start = time.time()
    
    start r
    
    print '{0:.2f} s'.format(time.time() - start)        

#  


if __name__ == '__main__':
  main()
